/*
 * jQuery.splitter.js - two-pane splitter window plugin
 *
 * version 1.51 (2009/01/09) 
 * 
 * Dual licensed under the MIT and GPL licenses: 
 *   http://www.opensource.org/licenses/mit-license.php 
 *   http://www.gnu.org/licenses/gpl.html 
 */

/**
 * The splitter() plugin implements a two-pane resizable splitter window.
 * The selected elements in the jQuery object are converted to a splitter;
 * each selected element should have two child elements, used for the panes
 * of the splitter. The plugin adds a third child element for the splitbar.
 * 
 * For more details see: http://methvin.com/splitter/
 *
 *
 * @example $('#MySplitter').splitter();
 * @desc Create a vertical splitter with default settings 
 *
 * @example $('#MySplitter').splitter({type: 'h', accessKey: 'M'});
 * @desc Create a horizontal splitter resizable via Alt+Shift+M
 *
 * @name splitter
 * @type jQuery
 * @param Object options Options for the splitter (not required)
 * @cat Plugins/Splitter
 * @return jQuery
 * @author Dave Methvin (dave.methvin@gmail.com)
 */
;
(function($) {

    $.fn.splitter = function(args) {
        args = args || {};
        return this.each(function() {
            var zombie; // left-behind splitbar for outline resizes


            function startSplitMouse(evt) {
                if (opts.outline) zombie = zombie || bar.clone(false).insertAfter(A);
                panes.css("-webkit-user-select", "none"); // Safari selects A/B text on a move
                bar.addClass(opts.activeClass);
                A._posSplit = A[0][opts.pxSplit] - evt[opts.eventPos];
                $(document).bind("mousemove", doSplitMouse).bind("mouseup", endSplitMouse);
            }

            function doSplitMouse(evt) {
                var newPos = A._posSplit + evt[opts.eventPos];
                if (opts.outline) {
                    newPos = Math.max(0, Math.min(newPos, splitter._DA - bar._DA));
                    bar.css(opts.origin, newPos);
                } else
                resplit(newPos);
            }

            function endSplitMouse(evt) {
                bar.removeClass(opts.activeClass);
                var newPos = A._posSplit + evt[opts.eventPos];
                if (opts.outline) {
                    zombie.remove();
                    zombie = null;
                    resplit(newPos);
                }
                panes.css("-webkit-user-select", "text"); // let Safari select text again
                $(document).unbind("mousemove", doSplitMouse).unbind("mouseup", endSplitMouse);
            }

            function resplit(newPos) {
                // Constrain new splitbar position to fit pane size limits
                newPos = Math.max(A._min, splitter._DA - B._max, Math.min(newPos, A._max, splitter._DA - bar._DA - B._min));
                // Resize/position the two panes
                bar._DA = bar[0][opts.pxSplit]; // bar size may change during dock
                bar.css(opts.origin, newPos).css(opts.fixed, splitter._DF);
                A.css(opts.origin, 0).css(opts.split, newPos).css(opts.fixed, splitter._DF);
                B.css(opts.origin, newPos + bar._DA).css(opts.split, splitter._DA - bar._DA - newPos).css(opts.fixed, splitter._DF);
                // IE fires resize for us; all others pay cash
                if (!$.browser.msie) panes.trigger("resize");
            }

            function dimSum(jq, dims) {
                // Opera returns -1 for missing min/max width, turn into 0
                var sum = 0;
                for (var i = 1; i < arguments.length; i++)
                sum += Math.max(parseInt(jq.css(arguments[i])) || 0, 0);
                return sum;
            }

            // Determine settings based on incoming opts, element classes, and defaults
            var vh = (args.splitHorizontal ? 'h' : args.splitVertical ? 'v' : args.type) || 'v';
            var opts = $.extend({
                activeClass: 'active',
                // class name for active splitter
                pxPerKey: 8,
                // splitter px moved per keypress
                tabIndex: 0,
                // tab order indicator
                accessKey: '' // accessKey for splitbar
            }, {
                v: { // Vertical splitters:
                    keyLeft: 39,
                    keyRight: 37,
                    cursor: "e-resize",
                    splitbarClass: "vsplitbar",
                    outlineClass: "voutline",
                    type: 'v',
                    eventPos: "pageX",
                    origin: "left",
                    split: "width",
                    pxSplit: "offsetWidth",
                    side1: "Left",
                    side2: "Right",
                    fixed: "height",
                    pxFixed: "offsetHeight",
                    side3: "Top",
                    side4: "Bottom"
                },
                h: { // Horizontal splitters:
                    keyTop: 40,
                    keyBottom: 38,
                    cursor: "n-resize",
                    splitbarClass: "hsplitbar",
                    outlineClass: "houtline",
                    type: 'h',
                    eventPos: "pageY",
                    origin: "top",
                    split: "height",
                    pxSplit: "offsetHeight",
                    side1: "Top",
                    side2: "Bottom",
                    fixed: "width",
                    pxFixed: "offsetWidth",
                    side3: "Left",
                    side4: "Right"
                }
            }[vh], args);

            // Create jQuery object closures for splitter and both panes
            var splitter = $(this).css({
                position: "relative"
            });
            var panes = $(">*", splitter[0]).css({
                position: "absolute",
                // positioned inside splitter container
                "z-index": "1",
                // splitbar is positioned above
                "-moz-outline-style": "none" // don't show dotted outline
            });
            var A = $(panes[0]); // left  or top
            var B = $(panes[1]); // right or bottom
            // Focuser element, provides keyboard support; title is shown by Opera accessKeys
            var focuser = $('<a href="javascript:void(0)"></a>').attr({
                accessKey: opts.accessKey,
                tabIndex: opts.tabIndex,
                title: opts.splitbarClass
            }).bind($.browser.opera ? "click" : "focus", function() {
                this.focus();
                bar.addClass(opts.activeClass)
            }).bind("keydown", function(e) {
                var key = e.which || e.keyCode;
                var dir = key == opts["key" + opts.side1] ? 1 : key == opts["key" + opts.side2] ? -1 : 0;
                if (dir) resplit(A[0][opts.pxSplit] + dir * opts.pxPerKey, false);
            }).bind("blur", function() {
                bar.removeClass(opts.activeClass)
            });

            // Splitbar element, can be already in the doc or we create one
            var bar = $(panes[2] || '<div></div>').insertAfter(A).css("z-index", "100").append(focuser).attr({
                "class": opts.splitbarClass,
                unselectable: "on"
            }).css({
                position: "absolute",
                "user-select": "none",
                "-webkit-user-select": "none",
                "-khtml-user-select": "none",
                "-moz-user-select": "none"
            }).bind("mousedown", startSplitMouse);
            // Use our cursor unless the style specifies a non-default cursor
            if (/^(auto|default|)$/.test(bar.css("cursor"))) bar.css("cursor", opts.cursor);

            // Cache several dimensions for speed, rather than re-querying constantly
            bar._DA = bar[0][opts.pxSplit];
            splitter._PBF = $.boxModel ? dimSum(splitter, "border" + opts.side3 + "Width", "border" + opts.side4 + "Width") : 0;
            splitter._PBA = $.boxModel ? dimSum(splitter, "border" + opts.side1 + "Width", "border" + opts.side2 + "Width") : 0;
            A._pane = opts.side1;
            B._pane = opts.side2;
            $.each([A, B], function() {
                this._min = opts["min" + this._pane] || dimSum(this, "min-" + opts.split);
                this._max = opts["max" + this._pane] || dimSum(this, "max-" + opts.split) || 9999;
                this._init = opts["size" + this._pane] === true ? parseInt($.curCSS(this[0], opts.split)) : opts["size" + this._pane];
            });

            // Determine initial position, get from cookie if specified
            var initPos = A._init;
            if (!isNaN(B._init)) // recalc initial B size as an offset from the top or left side
            initPos = splitter[0][opts.pxSplit] - splitter._PBA - B._init - bar._DA;
            if (opts.cookie) {
                if (!$.cookie) alert('jQuery.splitter(): jQuery cookie plugin required');
                var ckpos = parseInt($.cookie(opts.cookie));
                if (!isNaN(ckpos)) initPos = ckpos;
                $(window).bind("unload", function() {
                    var state = String(bar.css(opts.origin)); // current location of splitbar
                    $.cookie(opts.cookie, state, {
                        expires: opts.cookieExpires || 365,
                        path: opts.cookiePath || document.location.pathname
                    });
                });
            }
            if (isNaN(initPos)) // King Solomon's algorithm
            initPos = Math.round((splitter[0][opts.pxSplit] - splitter._PBA - bar._DA) / 2);

            // Resize event propagation and splitter sizing
            if (opts.anchorToWindow) {
                // Account for margin or border on the splitter container and enforce min height
                splitter._hadjust = dimSum(splitter, "borderTopWidth", "borderBottomWidth", "marginBottom");
                splitter._hmin = Math.max(dimSum(splitter, "minHeight"), 20);
                $(window).bind("resize", function() {
                    var top = splitter.offset().top;
                    var wh = $(window).height();
                    splitter.css("height", Math.max(wh - top - splitter._hadjust, splitter._hmin) + "px");
                    if (!$.browser.msie) splitter.trigger("resize");
                }).trigger("resize");
            } else if (opts.resizeToWidth && !$.browser.msie) $(window).bind("resize", function() {
                splitter.trigger("resize");
            });

            // Resize event handler; triggered immediately to set initial position
            splitter.bind("resize", function(e, size) {
                // Custom events bubble in jQuery 1.3; don't get into a Yo Dawg
                if (e.target != this) return;
                // Determine new width/height of splitter container
                splitter._DF = splitter[0][opts.pxFixed] - splitter._PBF;
                splitter._DA = splitter[0][opts.pxSplit] - splitter._PBA;
                // Bail if splitter isn't visible or content isn't there yet
                if (splitter._DF <= 0 || splitter._DA <= 0) return;
                // Re-divvy the adjustable dimension; maintain size of the preferred pane
                resplit(!isNaN(size) ? size : (!(opts.sizeRight || opts.sizeBottom) ? A[0][opts.pxSplit] : splitter._DA - B[0][opts.pxSplit] - bar._DA));
            }).trigger("resize", [initPos]);
        });
    };

})(jQuery);